2007 · 15 citations · 0 references
Natural SciencesNuclear EngineeringPhysicsNuclear PhysicsParticle PhysicsRadiation ProtectionAccelerator PhysicsAccelerator ShieldingCollider PhysicsHeavy-ion PhysicsImpedance MatchingRadiation-resistant MaterialsBeam CollimationCollimator DesignCollimator ShieldingHadron Collider PhysicsHeavy-ion AcceleratorsHigh-intensity Beam PhysicsResistive Wall ModesShielding For Linear Accelerators
The transverse impedance in the LHC is expected to be dominated by the numerous collimators, most of which are made of Fibre-Reinforced-Carbon to withstand the impacts of high intensity proton beams in case of failures, and which will be moved very close to the beam, with full gaps of few millimetres, in order to protect surrounding super-conducting equipments. We present an estimate of the transverse resistive-wall impedance of the LHC collimators, the total impedance in the LHC at injection and top energy, the induced coupled-bunch growth rates and tune shifts, and finally the result of the comparison of the theoretical predictions with measurements performed in 2004 and 2006 on a prototype collimator installed in the SPS.